Question
A frog leaps across 20 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the sixth  lily pad to the eighth lily pad. How long does it take for the frog to leap from the fifteenth lily pad to the seventeenth lily pad?
4 m

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A frog leaps across 20 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the sixth  lily pad to the eighth lily pad. How long does it take for the frog to leap from the fifteenth lily pad to the seventeenth lily pad?